|BBC Research and Development Report Number 1980-02|
R&D Report 1980-02 : Carfax': an example of an f.m. signal generated using digital techniques. P. Shelswell This report describes a method of generating frequency-modulated signals using digital techniques. The digital process introduces little distortion and provides a stable centre frequency. The drive for a "CARFAX" transmitter is described as an example of its application.
Keywords: frequency; signal; sampling; carrier; quantizing; noise; modulation; digital; accuracy; analogue; stable centre; quantizing errors; sampling frequency; error signal; carrier frequency; digital techniques; angular frequency; modulating signal; signal generated; noise power
|BBC Research and Development Report Number 1961-07|
R&D Report 1961-07 : Crystal-diode modulators for the frequency range 10-1000 Mc/s. G.J. Phillips, R.G. Manton This report describes the development of low-power balanced diode modulators suitable for amplitude modulation by television or sound signals of a carrier in the frequency range 10-1000 Mc/s. From an original model, built in 1954, two later models have been developed having better performance in regard to the insertion loss at the carrier frequency, and uniformity of modulation response...
Keywords: modulator; modulation; frequency; insertion; signal; amplitude; impedance; transformer; output; phase; modulating signal; carrier frequency; insertion loss; modulation input; frequency response; frequency range; unwanted phase; signal generator; modulation frequency; good performance
|BBC Research and Development Report Number 1963-64|
R&D Report 1963-64 : Line-store standards conversion: The subjective effect of certain switch and store imperfections V.G. Devereux The experiments described in this report were carried out in order to investigate the subjective effect of interference on a television display caused by variations in the transfer characteristics of the switches and storage devices in a line-store standards converter; these variations in the characteristics of switches and storage devices result in perturbations of...
Keywords: signal; modulation; luminance; level; video; modulating; interference; subjective; perturbing; switches; subjective tests; subjective effects; storage devices; modulation level; video signal; modulating signal; luminance corresponding; black level; perturbing signal; sawtooth video
|national :: appNotes :: AN-0899|
From the bitsavers.org collection, a scanned-in computer-related document.national :: appNotes :: AN-0899
Keywords: quadrature; modulating; modulator; phase; frequency; amplitude; carrier; signal; error; vector; frequency spectrum; eye diagram; quadrature modulator; national semiconductor; modulating signal; phase shift; ssb test; modulating signals; phase error; error terms
|73 Magazine (March 1962)|
73 Magazine March 1962 (#18) Printed Circuit VFO - Extreme stability and simplicity of construction in this 50 MHz VFO may bug you to build ...... W5UB 6 Regulated Bias Supply - Great for linears, develops -20 to -120V @ 0-70 mA and presents only 6 ohms to grid ...... W5IUR 12 Check Transistors with an Ohmmeter - Here is the simplest test for transistors yet, and it's safe and works ...... W9QKC 14 Radar Detector - All you 2,500 MHz SWL's (UNFL's?) will appreciate this mobile receiver ........
Keywords: antenna; frequency; meter; circuit; output; power; modulation; signal; receiver; pulse; power supply; modulating signal; half wave; front panel; tank circuit; amateur radio; sale price; plate tank; screen grid; power output
|73 Magazine (October 1969)|
73 Magazine October 1969 (#109) A Super-Gain Antenna for 40 Meters - Nine db on 40 meters might be called "super" ...... W4NVK 8 DX Corner - WTW reports and other DX jazz ...... K2AGZ 12 FET Chirper - Signal source for peaking converters for optimum signal/noise ...... K6QKL 20 The Inside Info on Alexander Graham - Or how the telephone really works ...... W2FEZ 24 Leaky Lines - Similar to "Grumbles," but by a licensed amateur, not a CB'er ........
Keywords: signal; frequency; modulation; amateur; arrl; radio; antenna; modulating; power; receiver; amateur radio; modulating signal; super gain; power supply; ham radio; field service; power level; modulation percentage; audio output; output signal